BlackBerry 7250

I just bought a used blackberry 7250. it works great. It appears, though, that originally it was set up with an Enterprise Activation. They set it up where a password was required. I called TechSupport and they said that the only way to disable the password is for me to go back to the server where the enterprise activation was and have them disconnect. That is not an option, so I wondered if anyone knew of a way to basically reset the blackberry that has already had an enterprise activation to no longer have any connection to that, so that I can disable the password protection.
Thanks!